<script setup lang="ts">
import {
  IGoodsDetail,
  ISkus,
  ISpecs,
  ISpecsValues
} from '@/service/api/type/goods.type'
import { getPowerSet } from '@/utils/power-set'
import { IPathMap } from '../type'
const props = withDefaults(
  defineProps<{
    goods: IGoodsDetail
  }>(),
  {}
)

const emit = defineEmits<{
  (e: 'change', skus: any): void
}>()

const spliter = '★'
// 根据skus数据得到路径字典对象
const getPathMap = (skus: ISkus[]) => {
  const pathMap: IPathMap = {}
  skus.forEach((sku) => {
    // 1. 得到sku属性值数组
    const specs = sku.specs.map((spec) => spec.valueName)
    // 2. 得到sku属性值数组的子集
    const powerSet = getPowerSet(specs)
    // 3. 设置给路径字典对象
    powerSet.forEach((set) => {
      const key = set.join(spliter)
      if (pathMap[key]) {
        // 已经有key往数组追加
        pathMap[key].push(sku.id)
      } else {
        // 没有key设置一个数组
        pathMap[key] = [sku.id]
      }
    })
  })
  return pathMap
}
const pathMap = getPathMap(props.goods.skus)
// 更新按钮的禁用状态
const updateDisabledStatus = (specs: ISpecs[], pathMap: IPathMap) => {
  specs.forEach((spec, i) => {
    const selectedArr = getSelectedArr(specs)
    console.log(selectedArr)
    spec.values.forEach((val) => {
      // 已经选中的按钮不用判断
      if (val.name === selectedArr[i]) return false
      // 未选中的替换对应的值
      selectedArr[i] = val.name
      // 过滤无效值得到key
      const key = selectedArr.filter((v) => v).join(spliter)
      // 设置禁用状态
      val.disabled = !pathMap[key]
    })
  })
}

const getSelectedArr = (specs: ISpecs[]) => {
  const selectedArr: (string | null)[] = []
  specs.forEach((spec) => {
    const selectedVal = spec.values.find((val) => val.selected)
    selectedArr.push(selectedVal ? selectedVal.name : null)
  })
  return selectedArr
}

// updateDisabledStatus(props.goods.specs, pathMap)

const clickSpecs = (item: ISpecs, val: ISpecsValues) => {
  if (val.disabled) return false
  if (val.selected) {
    val.selected = false
  } else {
    item.values.find((bv) => {
      bv.selected = false
    })
    val.selected = true
  }
  updateDisabledStatus(props.goods.specs, pathMap)

  // 触发change事件将sku数据传递出去
  const selectedArr = getSelectedArr(props.goods.specs).filter((v) => v)
  if (selectedArr.length === props.goods.specs.length) {
    const skuIds = pathMap[selectedArr.join(spliter)]
    const sku = props.goods.skus.find((sku) => sku.id === skuIds[0])
    // 传递
    if (sku) {
      emit('change', {
        skuId: sku.id,
        price: sku.price,
        oldPrice: sku.oldPrice,
        inventory: sku.inventory,
        specsText: sku.specs
          .reduce((p, n) => `${p} ${n.name}：${n.valueName}`, '')
          .replace(' ', '')
      })
    }
  } else {
    emit('change', {})
  }
}
</script>

<template>
  <div class="goods-sku">
    <dl v-for="(item, index) in goods.specs" :key="index">
      <dt>{{ item.name }}</dt>
      <dd>
        <template v-for="val in item.values" :key="val.name">
          <img
            :class="{ selected: val.selected, disabled: val.disabled }"
            @click="clickSpecs(item, val)"
            v-if="val.picture"
            :src="val.picture"
            :title="val.name"
          />
          <span
            :class="{ selected: val.selected, disabled: val.disabled }"
            @click="clickSpecs(item, val)"
            v-else
            >{{ val.name }}</span
          >
        </template>
      </dd>
    </dl>
  </div>
</template>

<style lang="less" scoped>
.sku-state-mixin () {
  border: 1px solid #e4e4e4;
  margin-right: 10px;
  cursor: pointer;
  &.selected {
    border-color: @themeColor;
  }
  &.disabled {
    opacity: 0.6;
    border-style: dashed;
    cursor: not-allowed;
  }
}
.goods-sku {
  padding-left: 10px;
  padding-top: 20px;
  dl {
    display: flex;
    padding-bottom: 20px;
    align-items: center;
    dt {
      width: 50px;
      color: #999;
    }
    dd {
      flex: 1;
      line-height: 40px;
      color: #666;
      > img {
        width: 50px;
        height: 50px;
        .sku-state-mixin ();
      }
      > span {
        display: inline-block;
        height: 30px;
        line-height: 28px;
        padding: 0 20px;
        .sku-state-mixin ();
      }
    }
  }
}
</style>
